Chem 120 week 1 BEST STUDYING
MATERIAL WITH VERIFIED ANSWERS
LATEST VERSION UPDATE 2024-2025 WITH
100+ QUESTIONS
What is a physical change?
- ANSWER A change in a substance that does not involve a change in the identity
of the substance.
examples of physical properties?
- ANSWER Color, odor, mass, density, specific heat, malleability, ductility,
conductivity, melting point, boiling point, magnetism.
What are the 3 phases of physical properties?
- ANSWER Solid, gas, liquid
What is a chemical change?
- ANSWER Changing of one substance into a new substance that has different
properties
Examples of chemical change are?
- ANSWER Bubbles of gas is given off, flame or explosion when ignited, glass of
milk becomes sour, wood burns in a fire place, mold grows on cheese, silver metal
tarnishes.
,The smallest unit of an element that retains the chemical properties of that
element is called?
- ANSWER Atom
What are the structures of an atom?
- ANSWER -Electrons - negatively charged subatomic particles
-Protons - positively charged subatomic particles
-Neutrons - uncharged subatomic particles
What are the subatomic particles and their relationships?
- ANSWER Protons, +1, 1 AMU Mass
Neutron, 0 charge, 1 AMU mass
Electron, -1 charge, 0 AMU mass (# electrons = # protons)
Mass number (average at bottom of periodic square ➢Mass number = protons +
neutrons
What is an atomic number?
- ANSWER All atoms of an element have the same number of protons.
The number of protons in an atom of an element is called its atomic number. (Z)
Where is atomic number located?
- ANSWER The atomic number is indicated in most periodic tables above the
element symbol.
, atomic number of carbon?
- ANSWER 6 protons
What is neutron number?
- ANSWER Subtract atomic number from mass number
What is an Isotope of an element?
- ANSWER -is an atom that contains a specific number of neutrons
-Many elements have multiple isotopes.
What is an isotope symbol?
- ANSWER The subscript in the isotope symbol is the atomic
number; We never change this as this changes the
-The superscript in the isotope symbol is the mass,
number. This changes for every isotope ——-11/5B
What is an ion?
- ANSWER Ions differ from atoms in that they have a charge; the number of
electrons is either greater than, or less than, the number of protons.
What are the two types of ion?
- ANSWER Cations are positively charged. They have fewer electrons than in the
neutral atom.
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